Stress test shows biggest capital deficit at Bankia.

Bailout follows three failed attempts to shore up nations banking system.

Bailout follows three failed attempts to shore up nations banking system.

Montoro says European institutions should help shore up Spains banks.

Montoro says European institutions should help shore up Spains banks.

Spains third-largest bank has asked government for $24 bln in aid.

Spains third-largest bank has asked government for $24 bln in aid.

Surge in non-performing loans calls into question government plan to clean up banks.